Magnetic liquid sealing device having heat conductive rod and heat dissipating jacket

Abstract

A magnetic liquid sealing device (100) with a heat conductive rod and a heat dissipating jacket includes: a shaft casing (1), a rotating shaft (2), two bearings (3), two pole shoes (4), a permanent magnet (5), a heat conductive rod (6) and a heat dissipating jacket (7). The rotating shaft (2) is rotatably arranged in the shaft casing (1), two bearings (3) and two pole shoes (4) are fitted over the rotating shaft (2), and the two pole shoes (4) are located between the two bearings (3). The permanent magnet (5) is fitted over the rotating shaft (2) and is located between the two pole shoes (4). The heat conductive rod (6) is inserted in the pole shoe (4), the heat dissipating jacket (7) is fitted over the shaft casing (2), and the heat conductive rod (6) is connected with the heat dissipating jacket (7) through a connecting member (11).

The invention claimed is: 
     
       1. A magnetic liquid sealing device having a heat conductive rod and a heat dissipating jacket, comprising:
 a shaft casing defining a shaft chamber therein; 
 a rotating shaft rotatably provided in the shaft chamber, and extending from one end of the shaft chamber to the other end of the shaft chamber; 
 two bearings individually fitted over the rotating shaft; 
 two pole shoes individually fitted over the rotating shaft and located between the two bearings, magnetic liquid being absorbed between an inner peripheral surface of each pole shoe and an outer peripheral surface of the rotating shaft, and an outer peripheral surface of each pole shoe having a blind hole extending along a radial direction of the pole shoe; and 
 a permanent magnet fitted over the rotating shaft and located between the two pole shoes; 
 wherein the heat conductive rod is inserted in the blind hole; and 
 wherein the heat dissipating jacket is fitted over the shaft casing and connected with the heat conductive rod through a connecting member. 
 
     
     
       2. The magnetic liquid sealing device according to  claim 1 , wherein a plurality of blind holes are provided on each pole shoe and distributed evenly along a circumferential direction. 
     
     
       3. The magnetic liquid sealing device according to  claim 2 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       4. The magnetic liquid sealing device according to  claim 1 , wherein each of the two pole shoes is provided with a convex rim on a side away from the other pole shoe, the convex rim abutting against an outer circle of the bearing, and each of the two pole shoes abuts against an end surface of the permanent magnet on a side facing the other pole shoe. 
     
     
       5. The magnetic liquid sealing device according to  claim 4 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       6. The magnetic liquid sealing device according to  claim 1 , further comprising: a pair of sealing rings provided between each pole shoe and the shaft casing, the heat conductive rod being located between the sealing rings arranged in pairs. 
     
     
       7. The magnetic liquid sealing device according to  claim 6 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       8. The magnetic liquid sealing device according to  claim 1 , wherein one end of the shaft casing is formed with a first protrusion, one of the bearings abuts against the first protrusion, the other end of the shaft casing is connected with a flange, and the flange has a second protrusion extending into the shaft chamber. 
     
     
       9. The magnetic liquid sealing device according to  claim 8 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       10. The magnetic liquid sealing device according to  claim 8 , further comprising: a sleeve fitted over the rotating shaft and located between the second protrusion and the other bearing. 
     
     
       11. The magnetic liquid sealing device according to  claim 10 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       12. The magnetic liquid sealing device according to  claim 8 , further comprising: an adjusting washer sandwiched among the shaft casing, the heat dissipating jacket and the flange. 
     
     
       13. The magnetic liquid sealing device according to  claim 12 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       14. The magnetic liquid sealing device according to  claim 1 , wherein the heat dissipating jacket is made of one material of red copper and heat conducting graphite. 
     
     
       15. The magnetic liquid sealing device according to  claim 14 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       16. The magnetic liquid sealing device according to  claim 1 , wherein the thickness of the heat dissipating jacket ranges from 2 mm to 10 mm. 
     
     
       17. The magnetic liquid sealing device according to  claim 16 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket. 
     
     
       18. The magnetic liquid sealing device according to  claim 1 , wherein one end of the heat conductive rod passes through the shaft casing and abuts against an inner peripheral surface of the heat dissipating jacket.